Pit Stall Selections - Lowe's Motor Speedway

(NASCAR Statistics)

How are pit stall's chosen? by qualifying speeds, the fastest choose their stall and so on.
If qualifying is canceled, then the teams pick by owners points position/race attempts.
If a car/driver has to go to the rear of the field before the start of the race due to driver change, backup car,
engine/transmission change, etc they do NOT lose their pit stall selection